[Kenwood] CW Tone and CW IF Filter in the TS-570S?

[Rob Frohne]

Hi All,

Well, here I am answering my own question....  The two filters are 
different by 700 Hz in the passband!   The YK-88C is 8830.7 KHz and the 
YK-88C-1 is 8830.0 KHz according to a FAQ at the Kenwood site.  One 
interesting thing is that according to same Kenwood FAQ the YK-88CN-1 
and the YK-88-CN are both listed as 8830.7 KHz.  I suspect that is a 
misprint.

Arghh....  Anyone want to swap a YK-88C for a YK-88C-1 or a YK-88CN-1?  
The YK-88C is supposed to work in the following radios:  
TS-130E-S-V/430S/440S/530S-SP/830S/670 and the R-5000.

73,

Rob, KL7NA
On Mar 20, 2005, at 7:14 PM, Rob Frohne wrote:

> Hi Gentlemen:
>
> I just installed a YK-88C in my TS-570SG, and I'm surprised to find 
> what seems to be a bug in the firmware of the TS-570SG, or perhaps the 
>  YK-88C isn't the same frequency as the YK-88C-1.  What I notice is 
> this:  As I change the CW audio frequency (through the menu) instead 
> of seeing the IF passband shift with the AF passband as it seems it 
> should, I note that the background noise peaks up at 400 Hz (and I 
> can't tune lower than that, so I don't know if it is really the peak).
>
> Can any of you explain this behavior?
>
> Tnx & 73,
>
> Rob, KL7NA
> --
> Rob Frohne, Ph.D., P.E.
> E.F. Cross School of Engineering
> Walla Walla College
> http://www.wwc.edu/~frohro/
>
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--
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla College
http://www.wwc.edu/~frohro/